| jwh107 |
August 13, 2016 11:03 |
Strange Result.
5 Attachment(s)
Hello.
Recently I am doing some ducted fan simulation with openFoam.
I faced bad errors. (Wedge Planner error)
But it is now cleared and I can actually run the case.
But I see the result is completely wrong compare to what I want to simulate.
Attachment 49850
Attachment 49851
I want this kind of simulation result. But I got a strange result.
Like this
Attachment 49852
Attachment 49853
I created a axis symmetry ducted fan geometry and meshing it with Gmsh 12.0.2. Also, I created baffle in the ducted fan so that I can simulate a propeller with pressure jump.
It seems the pressure was jumped but the velocity is not changed at all.
I don't know why :confused:
could you shed some light on this case?
In case of you are asking how I set the baffledict or other things.
It goes same with this youtube. The only difference is mesh.
https://www.youtube.com/watch?v=qTYAr8jgViM
My mesh is looks like this
https://drive.google.com/file/d/0B2L...ew?usp=sharing
https://drive.google.com/file/d/0B2L...ew?usp=sharing
https://drive.google.com/file/d/0B2L...ew?usp=sharing
Mesh file (with gmsh)
Code:
Point(1) = { 326.8521 , -47.7156 , 0 };
Point(2) = { 326.1980 , -32.7490 , 0 };
Point(3) = { 322.3840 , -19.0429 , 0 };
Point(4) = { 315.8702 , -8.2505 , 0 };
Point(5) = { 307.4422 , -1.6735 , 0 };
Point(6) = { 297.8010 , -0.0336 , 0 };
Point(7) = { 286.8294 , -1.2079 , 0 };
Point(8) = { 275.9581 , -4.0512 , 0 };
Point(9) = { 265.2697 , -8.5418 , 0 };
Point(10) = { 254.8456 , -14.6455 , 0 };
Point(11) = { 244.7652 , -22.3159 , 0 };
Point(12) = { 235.1052 , -31.4946 , 0 };
Point(13) = { 225.9391 , -42.1118 , 0 };
Point(14) = { 217.3366 , -54.0865 , 0 };
Point(15) = { 209.3632 , -67.3278 , 0 };
Point(16) = { 202.0796 , -81.7349 , 0 };
Point(17) = { 195.5413 , -97.1980 , 0 };
Point(18) = { 189.7979 , -113.5995 , 0 };
Point(19) = { 184.8933 , -130.8146 , 0 };
Point(20) = { 180.8647 , -148.7122 , 0 };
Point(21) = { 177.7427 , -167.1562 , 0 };
Point(22) = { 175.5513 , -186.0062 , 0 };
Point(23) = { 174.3069 , -205.1187 , 0 };
Point(24) = { 174.0192 , -224.3483 , 0 };
Point(25) = { 174.6902 , -243.5485 , 0 };
Point(26) = { 179.6902 , -260.0080 , 0 };
Point(27) = { 184.6902 , -276.4675 , 0 };
Point(28) = { 189.6902 , -292.9269 , 0 };
Point(29) = { 194.6902 , -309.3864 , 0 };
Point(30) = { 199.6902 , -325.8459 , 0 };
Point(31) = { 204.6902 , -342.3053 , 0 };
Point(32) = { 209.6902 , -358.7648 , 0 };
Point(33) = { 214.6902 , -375.2243 , 0 };
Point(34) = { 219.6902 , -391.6838 , 0 };
Point(35) = { 224.6902 , -408.1432 , 0 };
Point(36) = { 229.6902 , -424.6027 , 0 };
Point(37) = { 234.6902 , -441.0622 , 0 };
Point(38) = { 239.6902 , -419.7222 , 0 };
Point(39) = { 244.6902 , -398.3822 , 0 };
Point(40) = { 249.6902 , -377.0422 , 0 };
Point(41) = { 254.6902 , -355.7022 , 0 };
Point(42) = { 259.6902 , -334.3622 , 0 };
Point(43) = { 264.6902 , -313.0222 , 0 };
Point(44) = { 269.6902 , -291.6823 , 0 };
Point(45) = { 274.6902 , -270.3423 , 0 };
Point(46) = { 279.6902 , -249.0023 , 0 };
Point(47) = { 284.6902 , -227.6623 , 0 };
Point(48) = { 289.6902 , -206.3223 , 0 };
Point(49) = { 294.6902 , -184.9823 , 0 };
Point(50) = { 299.6902 , -163.6423 , 0 };
Point(51) = { 304.6902 , -142.3023 , 0 };
Point(52) = { 309.6902 , -120.9624 , 0 };
Point(53) = { 314.6902 , -99.6224 , 0 };
Point(54) = { 319.6902 , -78.2824 , 0 };
Point(55) = { 324.6902 , -56.9424 , 0 };
Line(56) = {1:55,1};
Line Loop(57) = {56};
Point(58) = {0, -2000, 0, 100};
Point(59) = {0, 1500, 0, 100};
Point(60) = {2000, 1500, 0, 100};
Point(61) = {2000, -2000, 0, 100};
Point(62) = {0, -243.5, 0, 100};
Line(63) = {25, 62};
Line(64) = {62, 59};
Line(65) = {59, 60};
Line(66) = {60, 61};
Line(67) = {61, 58};
Line(68) = {58, 62};
Line(69) = {62, 25};
Line Loop(70) = {63:69};
Plane Surface(71) = {57, 70};
Transfinite Line {64, 68} = 200 Using Progression 1;
Transfinite Line {67, 65} = 100 Using Progression 1;
Transfinite Line {66} = 30 Using Progression 1;
Transfinite Line {63} = 60 Using Progression 1;
Transfinite Line {56} = 2000 Using Progression 1;
Rotate {{0,1,0},{0,0,0},2.5*Pi/180.0}
{
Surface{71};
}
new_entities[] = Extrude {{0,1,0},{0,0,0},-5*Pi/180.0}
{
Surface{71};
Layers{1};
Recombine;
};
Physical Surface("wedge0") = {71};
Physical Surface("wedge1") = {new_entities[0]};
Physical Surface("outlet") = {new_entities[4]};
Physical Surface("tunnel") = {new_entities[5]};
Physical Surface("inlet") = {new_entities[6]};
Physical Surface("duct") = {new_entities[2]};
Physical Surface("baffle") = {new_entities[7]}; // or 3
Physical Volume("AIR") = {1};
CheckMesh result
Code:
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 4.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 4.0-665f1db4c1f1
Exec : checkMesh
Date : Aug 13 2016
Time : 23:22:44
Host : "hyeon-System-Product-Name"
PID : 7356
Case : /home/hyeon/DuctedFan3/case
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time
Create polyMesh for time = 0
Time = 0
Mesh stats
points: 146363
internal points: 0
faces: 505455
internal faces: 214837
cells: 144138
faces per cell: 4.99724
boundary patches: 8
point zones: 0
face zones: 2
cell zones: 1
Overall number of cells of each type:
hexahedra: 0
prisms: 143288
wedges: 0
pyramids: 452
tet wedges: 0
tetrahedra: 398
polyhedra: 0
Checking topology...
Boundary definition OK.
Cell to face addressing OK.
Point usage OK.
Upper triangular ordering OK.
Face vertices OK.
Number of regions: 1 (OK).
Checking patch topology for multiply connected surfaces...
Patch Faces Points Surface topology
wedge0 144138 73381 ok (non-closed singly connected)
baffle 58 117 ok (non-closed singly connected)
baffleother 58 117 ok (non-closed singly connected)
outlet 99 199 ok (non-closed singly connected)
inlet 99 199 ok (non-closed singly connected)
wedge1 144138 73381 ok (non-closed singly connected)
duct 1999 3998 ok (non-closed singly connected)
tunnel 29 60 ok (non-closed singly connected)
Checking geometry...
Overall domain bounding box (0 -2000 -87.2388) (1998.1 1500 87.2388)
Mesh has 2 geometric (non-empty/wedge) directions (1 1 0)
Mesh has 3 solution (non-empty) directions (1 1 1)
Wedge wedge0 with angle 2.5 degrees
Wedge wedge1 with angle 2.5 degrees
All edges aligned with or perpendicular to non-empty directions.
Boundary openness (5.76858e-16 -5.3271e-18 1.47418e-16) OK.
Max cell openness = 3.26385e-16 OK.
Max aspect ratio = 20.3504 OK.
Minimum face area = 0.000547878. Maximum face area = 26007.7. Face area magnitudes OK.
Min volume = 0.00834115. Max volume = 1.25855e+06. Total volume = 6.09302e+08. Cell volumes OK.
Mesh non-orthogonality Max: 71.881 average: 7.42978
*Number of severely non-orthogonal (> 70 degrees) faces: 2.
Non-orthogonality check OK.
<<Writing 2 non-orthogonal faces to set nonOrthoFaces
Face pyramids OK.
Max skewness = 1.19735 OK.
Coupled point location match (average 0) OK.
Mesh OK.
End
Createbaffles result
HTML Code:
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 4.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 4.0-665f1db4c1f1
Exec : createBaffles -case case -dict system/baffleDict -overwrite
Date : Aug 13 2016
Time : 23:22:11
Host : "hyeon-System-Product-Name"
PID : 7344
Case : ./case
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time
Create mesh for time = 0
Reading baffle criteria from createBafflesDict
Not converting faces on non-coupled patches.
Reading geometric fields
Reading volScalarField p
Reading volScalarField nuTilda
Reading volScalarField nut
Reading volVectorField U
Created zone baffleFaces at index 1 with 58 faces
Patch 'baffle' already exists. Only moving patch faces - type will remain the same
Patch 'baffleother' already exists. Only moving patch faces - type will remain the same
Converted 58 faces into boundary faces in patches
2
(
baffle
baffleother
)
--> FOAM Warning :
From function int main(int, char**)
in file createBaffles.C at line 843
Setting field on boundary faces to zero.
You might have to edit these fields.
Writing mesh to 0
End
GmeshToFoam result
HTML Code:
/*---------------------------------------------------------------------------*\
| ========= | |
| \\ / F ield | OpenFOAM: The Open Source CFD Toolbox |
| \\ / O peration | Version: 4.0 |
| \\ / A nd | Web: www.OpenFOAM.org |
| \\/ M anipulation | |
\*---------------------------------------------------------------------------*/
Build : 4.0-665f1db4c1f1
Exec : gmshToFoam test.msh -case case
Date : Aug 13 2016
Time : 23:19:56
Host : "hyeon-System-Product-Name"
PID : 7325
Case : ./case
nProcs : 1
sigFpe : Enabling floating point exception trapping (FOAM_SIGFPE).
fileModificationChecking : Monitoring run-time modified files using timeStampMaster
allowSystemOperations : Allowing user-supplied system call operations
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
Create time
Starting to read mesh format at line 2
Read format version 2.2 ascii 0
Starting to read physical names at line 5
Physical names:8
Surface 1 wedge0
Surface 2 wedge1
Surface 3 outlet
Surface 4 tunnel
Surface 5 inlet
Surface 6 duct
Surface 7 baffle
Volume 8 AIR
Starting to read points at line 16
Vertices to be read:146363
Vertices read:146363
Starting to read cells at line 146382
Cells to be read:434699
Mapping region 1 to Foam patch 0
Mapping region 7 to Foam patch 1
Mapping region 3 to Foam patch 2
Mapping region 5 to Foam patch 3
Mapping region 2 to Foam patch 4
Mapping region 6 to Foam patch 5
Mapping region 4 to Foam patch 6
Mapping region 8 to Foam cellZone 0
Cells:
total:144138
hex :0
prism:143288
pyr :452
tet :398
CellZones:
Zone Size
0 144138
Skipping tag at line 581084
Patch 0 gets name wedge0
Patch 1 gets name baffle
Patch 2 gets name outlet
Patch 3 gets name inlet
Patch 4 gets name wedge1
Patch 5 gets name duct
Patch 6 gets name tunnel
--> FOAM Warning :
From function Foam::polyMesh::polyMesh(const Foam::IOobject&, const Foam::Xfer<Foam::Field<Foam::Vector<double> > >&, const cellShapeList&, const faceListList&, const wordList&, const wordList&, const Foam::word&, const Foam::word&, const wordList&, bool)
in file meshes/polyMesh/polyMeshFromShapeMesh.C at line 595
Found 290502 undefined faces in mesh; adding to default patch.
Finding faces of patch 0
Finding faces of patch 1
--> FOAM Warning :
From function int main(int, char**)
in file gmshToFoam.C at line 972
Could not match gmsh face 4(1 2009 4685 8) to any of the interior or exterior faces that share the same 0th point
Finding faces of patch 2
Finding faces of patch 3
Finding faces of patch 4
Finding faces of patch 5
Finding faces of patch 6
FaceZones:
Zone Size
1 58
Writing zone 0 to cellZone AIR and cellSet
Writing zone 1 to faceZone baffle and faceSet
End
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